py3: hack around inconsistency of type of name passed to DNSQuestion

I don't like this patch but this is the easiest way I could fix it. There are
some callers which pass name which is bytes, some pass name which is str. I just
encode() that if that's str.

This does makes test-paths.t pass, but I am not confident whether the whole of
zeroconf will work on py3 or not.

Differential Revision: https://phab.mercurial-scm.org/D6511

contrib/python3-whitelist

@@ -518,6 +518,7 b' test-pathconflicts-basic.t'
 test-pathconflicts-merge.t
 test-pathconflicts-update.t
 test-pathencode.py
+test-paths.t
 test-pending.t
 test-permissions.t
 test-phabricator.t

hgext/zeroconf/Zeroconf.py

@@ -89,6 +89,8 b' import threading'
 import time
 import traceback
 
+from mercurial import pycompat
+
 __all__ = ["Zeroconf", "ServiceInfo", "ServiceBrowser"]
 
 # hook for threads
@@ -270,6 +272,8 b' class DNSQuestion(DNSEntry):'
     """A DNS question entry"""
 
     def __init__(self, name, type, clazz):
+        if pycompat.ispy3 and isinstance(name, str):
+            name = name.encode('ascii')
         if not name.endswith(".local."):
             raise NonLocalNameException(name)
         DNSEntry.__init__(self, name, type, clazz)